Chapter $17,$ problem $1,$ part b$.$

What are the earliest start $($ES$)$ time, latest start $($LS$)$ time, earliest finish $($EF$)$ time, latest finish $($LF$)$ time, and slack time of activity $6?$

$23,23,33,33,0$

$23,37,26,40,14$

$33,40,37,44,7$

$33,33,44,44,0$